[Bug 254513] virtio_random: random_harvestq spinning on a CPU with Q35 virtio random device

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 12 Jan 2022 07:42:32 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254513

Dennis Noordsij <dennis.noordsij@alumni.helsinki.fi> changed:

           What    |Removed                     |Added
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                 CC|                            |dennis.noordsij@alumni.hels
                   |                            |inki.fi

--- Comment #32 from Dennis Noordsij <dennis.noordsij@alumni.helsinki.fi> ---
(Coming here via #261127 - "ifconfig wg0 destroy" also triggering this problem)

Can confirm this is (still) happening on Hetzner (CPX) VPS's with
13.0-RELEASE-p6

Blacklisting virtio_random fixes (works around) the issue.

Regarding ready installation images; I usually boot the rescue mode and install
manually by creating partitions and untarring the base system, so perhaps
Hetzner/Vultr provide installation media where virtio_random is already
pre-blacklisted).

Have a system available for any testing/debugging, or even just try to detect
if the issue would occur and not load the driver, if someone wants to point me
in the right direction.

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